Bryan Grassie, 18, of 16 Bartlett Lane, Wareham, was charged with murder after an autopsy determined that Mahoney died from multiple stab wounds, according to a press release issued Friday by the office of Plymouth County District Attorney Timothy Cruz.

Grassie is being held without bail at the Plymouth County jail. He will be arraigned on the murder charge Monday in Wareham District Court.

Grassie is accused of stabbing Brian and Brendan Mahoney early Sunday morning at the intersection of Hardy Street and Priscilla Avenue.

Grassie was found by police a few hours later in Plymouth, and was first arraigned July 30 on two charges of assault with intent to murder and two charges of assault and battery with a dangerous weapon.

The case remains under investigation by the district attorney, state police detectives and Wareham police.

Amy Carboneau may be reached at acarboneau@enterprisenews.com, or follow her on Twitter @amycarboneau.

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